This is the 3402nd most frequent Chinese word.
帶頭
To take the lead.
帶頭 is used here to mean 'taking the lead' in the context of problem-solving.
他在每次困難時總是帶頭解決問題。
He always takes the lead in solving problems during difficulties.
帶頭 is used here as 'to lead' in promoting a volunteer activity.
她願意帶頭進行這次的義工活動。
She is willing to lead this volunteer activity.
In this sentence, 帶頭 reflects the act of initiating improvements.